| Value | Category | 
                                    
                    
                        | 0 | No formal schooling | 
                                    
                    
                        | 1 | Primary only | 
                                    
                    
                        | 2 | Secondary | 
                                    
                    
                        | 3 | Post-secondary | 
                                    
                    
                        | 10 | Don't know | 
                                    
                    
                        | 98 | Refused to answer | 
                                    
                    
                        | 99 | Missing data | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.